Abstract
Desiccation cracking is a common problem of red clay under wet and dry conditions. The presence of cracks could reduce soil strength properties, which is the major reason for shallow failure of red clay slopes. This study aims to propose some additives to improve the crack resistance as well as the strength of red clay. To this end, three natural fibers and three natural gels were primarily selected to modify red clay. Desiccation crack tests were conducted to identify the best fiber and gel in terms of crack resistance. Then, direct shear tests and uniaxial tensile tests were performed on the soil specimens modified by the best fiber and gel to determine the optimal dosages regarding strength improvements. The results demonstrated that natural gels reduced the crack resistance of red clay, while natural fibers could enhance the crack resistance. Lignocellulose was the best additive in improving the crack resistance of red clay, and the modified effect was positively correlated with the fiber dosage. Adding 1.5% lignocellulose into red clay could reduce the crack rate from 2.19% to 0.30%, with a reduction of 0.86 times. The tensile strength, shear strength and its parameters of lignocellulose-modified red clay showed a trend of increasing first and then decreasing with increasing lignocellulose dosage. At the optimal lignocellulose dosage of 0.75%, the shear strength and tensile strength were increased by 44.63% and 18.21%, respectively. The strength of red clay modified by both lignocellulose and guar gum was positively correlated with the dosage of guar gum, and the desirable dosage of guar gum was 1.0%. In engineering practice, the wet red clay mixed with 0.75% lignocellulose and grass seeds can be employed as planting soil and is sprayed uniformly onto the slope surface after excavation using a spraying planting machine. To further improve the strength of the planting soil, 1.0% guar gum solution can be sprayed on the soil surface. The findings could provide useful guidance for the protection of red clay slopes.
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Abbreviations
- c :
-
The cohesion (kPa)
- F m :
-
The maximum tensile force (N)
- S :
-
The area of the middle cross-section of the specimen (m2)
- φ :
-
The internal friction angle (°)
- υ :
-
The dosage of guar gum (%).
- σ t :
-
The tensile strength (kPa)
- ω :
-
The lignocellulose dosage (%)
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Acknowledgments
The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (Nos. 52008041, 52078067, and 52078066); the Natural Science Foundation of Hunan Province, China (No. 2021JJ40576); the Youth Scientific and Technological Innovation Talents of Hunan Province (No. 2020RC306); the Outstanding Innovative Youth Training Program of Changsha city (No. kq1905043); and the Graduate Students Innovation Project of Hunan Province, China (No. CX20220861).
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Fu, HY., Yu, GT., Gao, QF. et al. Crack Resistance and Strength Properties of Red Clay Modified with Lignocellulose and Guar Gum. KSCE J Civ Eng 27, 4152–4162 (2023). https://doi.org/10.1007/s12205-023-2005-9
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DOI: https://doi.org/10.1007/s12205-023-2005-9